feat(python): add environment_class_name config option

[devin-ai-integration]

Description

Adds a new environment_class_name configuration option to the Python SDK generator, allowing users to customize the name of the generated environment class/enum.

Link to Devin run: https://app.devin.ai/sessions/90c5ae81ff4f4096a1666828e339ac2e
Requested by: [email protected] (@aditya-arolkar-swe)

Changes Made

Python Generator (v4.39.0)

• Added environment_class_name optional config field to SDKCustomConfig
• Updated EnvironmentsEnumDeclarationReferencer to accept and use custom environment class name
• Modified SdkGeneratorContextImpl to compute default as {ClientName}Environment and allow override via config
• Default behavior preserved: When environment_class_name is not specified, continues to use {ClientName}Environment (e.g., AcmeEnvironment)
• Added minor version bump entry to generators/python/sdk/versions.yml

Java Generator

• ⚠️ Note: Java generator changes are also present in this PR (added environment-class-name config option). These may need to be removed based on requirements.

Usage Example

# generators.yml
generators:
  - name: fernapi/fern-python-sdk
    version: 4.39.0
    config:
      environment_class_name: "CustomEnvironment"  # Optional: defaults to {ClientName}Environment

Testing

• Code compiles successfully
• Lint checks pass
• Seed tests run (not executed - may need snapshot updates)
• Manual testing with actual SDK generation (not performed)

Review Checklist

Critical items to verify:

1. ⚠️ Java changes: Confirm whether Java generator changes should be included or removed from this PR
2. Backward compatibility: Verify default behavior ({ClientName}Environment) is preserved when config is not specified
3. versions.yml: Confirm version bump (4.39.0) and changelog entry are correct
4. Seed snapshots: Determine if any seed test snapshots need updating (changes should be backward compatible, so likely no updates needed)
5. Config validation: Verify the new config field is properly validated and documented

Implementation details:

• The default is computed in SdkGeneratorContextImpl as f"{exported_client_class_name}Environment"
• Override is applied via custom_config.environment_class_name or default_env_class_name
• The EnvironmentsEnumDeclarationReferencer now receives the final computed name directly

[devin-ai-integration]

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